A box is illustrated at rest on the ground. According to Newton’s third law, four forces of equal magnitude are present. These forces are labelled P, Q, R and S. Forces P and Q act on the box. Forces R and S act on the Earth. To make the diagram easier to follow, the forces are drawn with small gaps between them. Which statement about the forces is correct?
- AP is the equal and opposite force to Q and both are forces of contact.
- BQ is the equal and opposite force to P and both are gravitational forces.
- CR is the equal and opposite force to S and both are forces of contact.
- DS is the equal and opposite force to Q and both are gravitational forces.